1 # Unified Makefile for i386 and x86_64
3 # select defconfig based on actual architecture
5 ifeq ($(shell uname -m),x86_64)
6 KBUILD_DEFCONFIG := x86_64_defconfig
8 KBUILD_DEFCONFIG := i386_defconfig
11 KBUILD_DEFCONFIG := $(ARCH)_defconfig
14 # How to compile the 16-bit code. Note we always compile for -march=i386;
15 # that way we can complain to the user if the CPU is insufficient.
17 # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
18 # older versions of GCC, include an *assembly* header to make sure that
19 # gcc doesn't play any games behind our back.
20 CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
21 M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
23 REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \
24 -DDISABLE_BRANCH_PROFILING \
25 -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
26 -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
28 $(call cc-option, -ffreestanding) \
29 $(call cc-option, -fno-stack-protector) \
30 $(call cc-option, -mpreferred-stack-boundary=2)
31 export REALMODE_CFLAGS
33 # BITS is used as extension for files which are available in a 32 bit
34 # and a 64 bit version to simplify shared Makefiles.
35 # e.g.: obj-y += foo_$(BITS).o
38 ifdef CONFIG_X86_NEED_RELOCS
39 LDFLAGS_vmlinux := --emit-relocs
43 # Prevent GCC from generating any FP code by mistake.
45 # This must happen before we try the -mpreferred-stack-boundary, see:
47 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
49 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
50 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
52 ifeq ($(CONFIG_X86_32),y)
55 CHECKFLAGS += -D__i386__
57 biarch := $(call cc-option,-m32)
58 KBUILD_AFLAGS += $(biarch)
59 KBUILD_CFLAGS += $(biarch)
61 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
63 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
64 # with nonstandard options
65 KBUILD_CFLAGS += -fno-pic
67 # prevent gcc from keeping the stack 16 byte aligned
68 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
70 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
71 # a lot more stack due to the lack of sharing of stacklots:
72 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
73 $(call cc-option,-fno-unit-at-a-time))
75 # CPU-specific tuning. Anything which can be shared with UML should go here.
76 include arch/x86/Makefile_32.cpu
77 KBUILD_CFLAGS += $(cflags-y)
79 # temporary until string.h is fixed
80 KBUILD_CFLAGS += -ffreestanding
84 CHECKFLAGS += -D__x86_64__ -m64
90 # Align jump targets to 1 byte, not the default 16 bytes:
91 KBUILD_CFLAGS += -falign-jumps=1
93 # Pack loops tightly as well:
94 KBUILD_CFLAGS += -falign-loops=1
96 # Don't autogenerate traditional x87 instructions
97 KBUILD_CFLAGS += $(call cc-option,-mno-80387)
98 KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
100 KBUILD_CFLAGS += -fno-pic
102 # Use -mpreferred-stack-boundary=3 if supported.
103 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
105 # Use -mskip-rax-setup if supported.
106 KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
108 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
109 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
110 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
112 cflags-$(CONFIG_MCORE2) += \
113 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
114 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
115 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
116 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
117 KBUILD_CFLAGS += $(cflags-y)
119 KBUILD_CFLAGS += -mno-red-zone
120 KBUILD_CFLAGS += -mcmodel=kernel
122 # -funit-at-a-time shrinks the kernel .text considerably
123 # unfortunately it makes reading oopses harder.
124 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
126 # this works around some issues with generating unwind tables in older gccs
127 # newer gccs do it by default
128 KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
131 # Make sure compiler does not have buggy stack-protector support.
132 ifdef CONFIG_CC_STACKPROTECTOR
133 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
134 ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
135 $(warning stack-protector enabled but compiler support broken)
140 x32_ld_ok := $(call try-run,\
141 /bin/echo -e '1: .quad 1b' | \
142 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
143 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
144 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
145 ifeq ($(x32_ld_ok),y)
146 CONFIG_X86_X32_ABI := y
147 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
148 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
150 $(warning CONFIG_X86_X32 enabled but no binutils support)
153 export CONFIG_X86_X32_ABI
155 # Don't unroll struct assignments with kmemcheck enabled
156 ifeq ($(CONFIG_KMEMCHECK),y)
157 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
160 # Stackpointer is addressed different for 32 bit and 64 bit x86
161 sp-$(CONFIG_X86_32) := esp
162 sp-$(CONFIG_X86_64) := rsp
164 # do binutils support CFI?
165 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
166 # is .cfi_signal_frame supported too?
167 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
168 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
170 # does binutils support specific instructions?
171 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
172 asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
173 asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
174 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
175 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
176 sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
177 sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
179 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(sha1_ni_instr) $(sha256_ni_instr)
180 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(sha1_ni_instr) $(sha256_ni_instr)
182 LDFLAGS := -m elf_$(UTS_MACHINE)
185 KBUILD_CFLAGS += -pipe
186 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
187 KBUILD_CFLAGS += -Wno-sign-compare
189 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
191 KBUILD_CFLAGS += $(mflags-y)
192 KBUILD_AFLAGS += $(mflags-y)
194 archscripts: scripts_basic
195 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
198 # Syscall table generation
201 $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
204 ifeq ($(CONFIG_KEXEC_FILE),y)
205 $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
211 head-y := arch/x86/kernel/head_$(BITS).o
212 head-y += arch/x86/kernel/head$(BITS).o
213 head-y += arch/x86/kernel/head.o
215 libs-y += arch/x86/lib/
217 # See arch/x86/Kbuild for content of core part of the kernel
220 # drivers-y are linked after core-y
221 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
222 drivers-$(CONFIG_PCI) += arch/x86/pci/
224 # must be linked after kernel/
225 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
227 # suspend and hibernation support
228 drivers-$(CONFIG_PM) += arch/x86/power/
230 drivers-$(CONFIG_FB) += arch/x86/video/
232 drivers-$(CONFIG_RAS) += arch/x86/ras/
235 # boot loader support. Several targets are kept for legacy purposes
237 boot := arch/x86/boot
239 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
241 PHONY += bzImage $(BOOT_TARGETS)
243 # Default kernel to build
246 # KBUILD_IMAGE specify target image being built
247 KBUILD_IMAGE := $(boot)/bzImage
250 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
251 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
253 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
254 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
255 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
257 $(BOOT_TARGETS): vmlinux
258 $(Q)$(MAKE) $(build)=$(boot) $@
262 $(Q)$(MAKE) $(build)=$(boot) $@
264 PHONY += vdso_install
266 $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
269 $(Q)rm -rf $(objtree)/arch/i386
270 $(Q)rm -rf $(objtree)/arch/x86_64
271 $(Q)$(MAKE) $(clean)=$(boot)
272 $(Q)$(MAKE) $(clean)=arch/x86/tools
273 $(Q)$(MAKE) $(clean)=arch/x86/purgatory
276 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
277 echo ' install - Install kernel using'
278 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
279 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
280 echo ' install to $$(INSTALL_PATH) and run lilo'
281 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
282 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
283 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
284 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
285 echo ' bzdisk/fdimage*/isoimage also accept:'
286 echo ' FDARGS="..." arguments for the booted kernel'
287 echo ' FDINITRD=file initrd for the booted kernel'